EP2173653B1

EP2173653B1 - A carousel for supporting and weighing containers

Info

Publication number: EP2173653B1
Application number: EP08789009A
Authority: EP
Inventors: Gianpietro Zanini; Marco Baroni
Original assignee: Azionaria Costruzioni Macchine Automatiche ACMA SpA
Current assignee: Azionaria Costruzioni Macchine Automatiche ACMA SpA
Priority date: 2007-08-02
Filing date: 2008-07-30
Publication date: 2012-10-31
Anticipated expiration: 2028-07-30
Also published as: ITBO20070549A1; US20100282523A1; WO2009016499A3; US8288668B2; WO2009016499A2; EP2173653A2; CN101821192A; CN101821192B; ES2398607T3

Description

Technical Field

The present invention relates to a carousel for supporting and weighing containers.
In particular, the present invention finds application to advantage in the art field of machine units for filling containers with a variety of different substances, typically liquid food products such as milk or fruit juices, and non-food products such as mineral lubricating oils, powders, detergents, etc.

Background Art

The prior art embraces units for filling containers with liquid or powder products, equipped with a carousel carrying a plurality of pedestals on which to stand the containers, each associated with a respective dispensing device from which a predetermined quantity of material is dropped into a container placed on the respective pedestal.
The operation of the single dispensing device is governed by respective weighing means coupled to the pedestal and able to sense the weight of the container continuously. At a given moment during the filling step when the weighing means indicate that a predetermined weight has been reached, signifying that the container is full, the dispensing device will interrupt the flow of liquid or powder material, for example by closing a shut-off valve on a feed duct through which the material is dispensed.
As a general rule, weighing means take the form of a dynamometer contained in a respective housing located beneath the pedestal on which the container is placed. The pedestal carries a plunger insertable through a hole in the top of the housing.
Thus, the plunger is located partly within the housing and able to interact with the dynamometer.
Conventional units of the type outlined above are washed down periodically in order to remove any residues of the liquid or powder products with which the containers are filled. In the course of filling operations, more exactly, part of the liquid or powder product can escape from the containers and drop onto the pedestal structure, onto the housing or onto the carousel.
At the end of a given production run, accordingly, nozzles are activated to direct a washing liquid onto the carousel, especially onto those areas where the residues are most heavily concentrated.
The washing process in question is a cause of major drawbacks however, due to the infiltration of washing liquid through the hole in the housing.
This happens, for example, in document FR 2 603 017 , according to the preamble of claim 1. In this document is described a weight-operated filling system of rotary type which is adapted to detect the weight of a vessel and content thereof by means of Roberval weigher which rotates with a cylindrical member about a longitudinal axis. A plurality of Roberval weigher are placed inside the cylindrical member, near a vertical plate through which, during washing operation, some liquid may enter, damaging the weighing means.
In effect, the dynamometer components include a piezoelectric material, and electronic parts that are easily damaged if brought into contact with a liquid.
Furthermore, carousels of the type described above are affected by a serious drawback linked to the structural complexity of the weighing means.
In effect, whenever the load cell of the dynamometer needs replacing or servicing, the entire housing first has to be removed from the carousel, whereupon the housing itself must be opened up in order to remove the dynamometer from the relative enclosure.
This servicing operation, normally a manual procedure, turns out to be particularly expensive and complicated, especially when considering the overall weight of the housing, coupled to the plunger and furnished internally with the load cell and all the electronic componentry of the weighing and filling system.

Disclosure of the invention

The object of the present invention, accordingly, is to provide a carousel for supporting and weighing containers that will be unaffected by the drawbacks mentioned above.
In particular, the object of the present invention is to provide a carousel for supporting and weighing containers, such as can undergo washing operations without being damaged.
Another object of the present invention is to set forth a carousel for supporting and weighing containers that is simple in construction and equipped with respective weighing means that are easily removed from the carousel.
The stated objects are realized in a carousel for supporting and weighing containers embodied according to the invention, which is defined by the apended claims.

Brief Description of the Drawings

The invention will now be described in detail, by way of example, with the aid of the accompanying drawings, in which:

figure 1 shows a container filling unit equipped with the carousel for supporting and weighing containers according to the present invention, viewed in a side elevation;
figure 2 shows a portion of the carousel in figure 1, illustrated in a side elevation and in section;
figure 3 shows a constructional detail of the carousel in figure 1, illustrated in a side elevation and in section.

Detailed description of the preferred embodiments of the invention

With reference to figure 1, numeral 1 denotes a carousel, considered in its entirety, for supporting and weighing containers 2, each presenting a neck 3 with a filler mouth 4 such as can be closed by fitting a cap.
As discernible from figure 1, the carousel 1 finds application to advantage in filling units 5 of the type by which liquid or powder products are batched into containers 2 as described above.
In particular, and as illustrated schematically in figure 1, the carousel 1 constitutes a part of the filling unit 5 and is rotatable about a respective vertical axis X.
The carousel 1 consists of a carrier element 6 designed to support a plurality of containers 2, which are caused to advance along a predetermined circular path as the carousel rotates about the vertical axis X.
The filling unit 5 further comprises a plurality of dispensing elements 7, each located directly above a corresponding container 2 in such a way as to release a liquid or powder product into the selfsame container 2 beneath.
The dispensing elements 7 are mounted preferably to the periphery of a frame 8. Both the frame 8 and the carousel 1 are coupled to a shaft 9 of which the longitudinal dimension extends parallel to the aforementioned axis X of rotation. During the step of filling the containers 2, accordingly, the carousel 1 and the frame 8 are caused to rotate as one about the vertical axis X.
Likewise preferably, the filling unit 5 comprises a collection tank 10 located beneath the carousel 1 and serving to catch the washing liquid falling from the carousel 1 and the frame 8.
Thus, when cleaning operations are carried out on the unit 5 as a whole, the washing liquid will run off the outer surfaces of the frame 8 and the carousel 1, and drain into the tank 10.
As illustrated to advantage in figure 2, the carrier element 6 appears as a disc 11 of substantially circular peripheral outline, presenting a top surface 11a that functions as a cover, and a bottom surface 11b lying opposite to the top surface 11a. The top surface 11a is angled downward away from an area adjacent to the aforementioned shaft 9 toward a peripheral rim 12 of the carrier element 6. The bottom surface 11b presents a substantially flat portion adjacent to the rim 12 and a portion angled downward from the flat portion toward an area adjacent to the shaft 9.
The bottom surface 11b also presents a plurality of openings 13, each formed in the aforementioned flat portion and spaced apart at a convenient distance one from the next around the entire circumferential length of the carrier element 6.
As illustrated to advantage in figure 2, each opening 13 affords a point of access to the interior of an enclosure 14 created within the carrier element 6 between the top surface 11a and the bottom surface 11b.
Each opening 13 is also furnished with a plate 15, associated removably with the bottom surface 11b in such a way as to close the relative opening 13.
In particular, and as shown in the detail illustration of figure 3, each plate 15 presents an inner surface 15a directed toward the carrier element 6 and an outer surface 15b directed toward the collection tank 10 (figure 1). The plate 15 is provided with separable fastening means 16 such as will allow it to be attached to or detached from the bottom surface 11b of the carrier element 6.
In a preferred solution, the separable fastening means 16 will consist in a set of screws 16a engaging in holes passing through the plate 15 and the bottom surface 11b.
Thus, by fastening and unfastening the screws 16a, the single plate 15 can be retained in a first condition, associated with and occluding the relative opening 13, and released so as to assume a second condition in which it is detached from the selfsame opening 13.
The carousel 1 further comprises means 17 by which to weigh the containers 2, associated with the plate 15 and housed at least partially in the aforementioned enclosure 14.
In particular, the weighing means 17 comprise a plurality of load cells 18 housed internally of the enclosure 14, each one of which coupled to a respective plate 15.
The single load cell 18, which is of substantially rectangular parallelepiped appearance, comprises a rigid portion denoted 18a, anchored to the inner surface 15a of the plate 15, and a movable portion denoted 18b, cantilevered from the rigid portion 18a.
When the plate 15 is detached from the bottom surface 11b, self-evidently, the opening 13 affords access to the inside of the enclosure 14. In this situation, the load cell 18 can be removed from the enclosure 14 for the purposes of servicing or replacement.
Also, the load cell 18 presents a cavity 19 between the rigid portion 18a and the movable portion 18b, which serves to enhance the flexible response of the component as will be explained more fully in due course.
Advantageously, the enclosure 14 also houses a stop 20 accommodated partially in a recess 20a afforded by the movable portion 18b of the load cell 18. The function of the stop 20 is to ensure that the travel of the movable portion 18b remains within a safe limit when the load cell 18 is flexed. Consequently, there will be no risk of damage to the load cell 18 caused by excessive flexural displacement of the movable portion 18b.
The weighing means 17 further comprise a plurality of pedestals 21 arranged around the top surface 11a, on which to stand respective containers 2. Each pedestal 21 is positioned facing a respective dispensing element 7 and supports the container 2 throughout the filling operation.
Each pedestal 21 can also be equipped with a vertical restraint 21a designed to latch onto the container 2 (figure 1) and ensure that it will not be flung away from the pedestal 21 during the rotation of the carousel 1.
In addition, each pedestal 21 is associated with a respective load cell 18 by way of a connecting element 22 that appears as an arm substantially of C profile, extending at least in part around the peripheral rim 12 of the carrier element 6 (figure 1).
The connecting element 22 presents a first end 22a associated with the load cell 18 and a second end associated with the respective pedestal 21.
As illustrated to advantage in figure 2 and in figure 3, each plate 15 presents a hole 23 admitting the first end 22a of the connecting element 22 to the inside of the enclosure 14. It will be seen that with this arrangement, the connecting element 22 is accommodated partly within the enclosure 14 and connectable to the movable portion 18b of the load cell 18.
It will be seen also that the first end 22a of the connecting element 22 presents a cylinder 24, anchored by way of suitable coupling means to the load cell 18, which passes through a sealing boot 25 associated with the respective plate 15 and designed to ensure that washing liquid directed onto the carrier element 6 will not find its way into the enclosure 14.
More exactly, the boot 25 is fitted to the hole 23 afforded by the plate 15 and presents a hollow interior allowing the passage of the cylinder 24 into the enclosure 14.
Moreover, and as illustrated to advantage in figure 3, the hollow interior of the boot 25 presents a series of mutually coaxial recesses 25a directed toward respective annular portions 24a of the cylinder 24. The annular portions 24a decrease in diameter the farther they are distanced from the load cell 18 and combine with the aforementioned recesses 25a to create a labyrinth seal by which any washing liquid directed at the area around the boot 25 is prevented from reaching and passing through the hole 23.
In effect, whenever the washing liquid begins to infiltrate the boot 25, the recesses 25a function as respective pockets able to retain the liquid. In addition, the annular portions 24a are angled downward in such a way that any liquid will run off the cylinder and out of the boot 25.
The second end 22b of the connecting element 22 presents a first portion 26 permanently associated with the relative pedestal 21, and a second portion 27 integral with the first end 22a. The portions 26 and 27 are interconnected by means of a separable coupling element 28, and consequently attachable to and detachable from one another.
In greater detail, the fastener element 28 presents a tubular portion 28a associated with the first portion 26 and mountable over a projection 28b of the second portion 27 (figure 3).
Moreover, located internally of the tubular portion 28a is a first magnet 29a attractable to a second magnet 29b presented by the aforementioned projection 28b.
Advantageously, the first portion 26 remains associated with the second portion 27 due to the force of attraction between the two magnets 29a and 29b. In the event that the pedestal 21 needs to be replaced, the first portion 26 can be separated from the second portion 27 by detaching the tubular portion 28a from the projection 28b.
Furthermore, the tubular portion 28a is proportioned in such a way as to fail mechanically when the weight of the container 2 placed on the respective pedestal 21 registers at a given value.
In short, the thickness of the tubular portion 28a and the material from which it is fashioned will be such as to induce deformation and subsequent rupture in the event of the container 2 taking on excessive weight. When the tubular portion 28a is damaged in this way, the second portion 27 will be replaced as described previously. The load cell 18 can therefore be protected from excessive flexural movement caused by excess weight of the container 2.
To advantage, the carrier element 6 also houses a delivery system 30, not described or illustrated in detail, by means of which to release air under pressure into the enclosure 14.
Accordingly, the overpressure will prevent any ingress into the enclosure 14 of a washing liquid directed onto the carousel 1.
In addition, the weighing means 17 comprise an electronic connecting component 31, housed in the enclosure 14 and designed to send an electrical signal to a control unit.
In particular, the electrical signal is generated by the component 31 to indicate the weight of the container 2, as represented by the extent to which the movable portion 18b of the load cell flexes in relation to the rigid portion 18a, and relayed to the aforementioned control unit (not described or illustrated in detail), which will be housed preferably in the filling unit 5.
Thus, as the container 2 fills, the connecting element 22 moves downwards and induces a corresponding downward displacement of the cylinder 24. The movable portion 18b of the load cell 18 consequently flexes downward, generating the aforementioned electrical signal to indicate to the weight of the container 2.
Advantageously, a liquid directed onto the overall structure of the carousel 1 runs down the carrier element 6 toward the collection tank 10 of the unit 5 (figure 1). The liquid will therefore not linger on any exposed surface of the carousel 1 and cannot drop into the enclosure 14 created within the carrier element 6. Accordingly, the load cell 18 is protected from any ingress of liquid that could otherwise occur.
The presence of pressurized air inside the enclosure 14 also ensures that liquids are kept out, even when penetrating to the point of infiltration.
Finally, the carousel 1 is structurally simple, and therefore unaffected by high costs.
In effect, when operations involving maintenance or replacement of the weighing means 17 become necessary, these can be performed by removing the plate 15 from the bottom surface 11b of the carrier element.
The load cell 18 can then be removed and replaced or serviced without difficulty. Advantageously, the operation in question requires no dismantling of complex and heavy mechanical components forming part of the carousel 1.

Claims

A carousel for supporting and weighing containers, comprising a carrier element (6) comprising a disc (11) having a top surface (11a) that functions as a cover, supporting at least one container (2), rotatable about a respective axis (X) and presenting at least one opening (13) affording access to an enclosure (14) within the selfsame element (6); at least one plate (15) associated with the carrier element (6), serving to close the opening (13), and means (17) by which to weigh the container (2), associated with the plate (15) and housed at least in part internally of the enclosure (14); said weighing means (17) comprising at least one load cell (18) housed in the enclosure (14) and attached to the plate (15), the carousel being characterized in that the carrier element (6) comprises a bottom surface (11b) presenting a plurality of said openings (13), each one of which furnished with a respective closing plate (15)
A carousel as in claim 1, further comprising separable fastening means (16) allowing the attachment and detachment of each plate (15) to and from the bottom surface (11b) of the carrier element (6), establishing a first condition in which the plate (15) is associated with the opening (13) and the load cell (18) housed internally of the enclosure (14), and a second condition in which the plate (15) is detached from the opening (13) and the load cell (18) removed from the enclosure (14).
A carousel as in claim 1 or 2, wherein weighing means (17) further comprise a plurality of pedestals (21) arranged around the top surface (11a), on which to stand respective containers (2), and a plurality of connecting elements (22) each presenting a first end (22a) associated with the load cell (18), and a second end (22b) associated with the respective pedestal (21); each plate (15) fashioned with a hole (23) allowing the passage of the first end (22a) of the respective connecting element (22) into the enclosure (14).
A carousel as in claim 4 3, wherein each connecting element (22) presents an arm substantially of C-shaped profile extending around a peripheral rim (12) of the carrier element (6).
A carousel as in claim 3 or 4, further comprising a sealing boot (25) associated with the plate (15) at the respective hole (23) and designed to ensure that a washing liquid directed onto the carrier element (6) will not infiltrate the enclosure (14).
A carousel as in claims 3 to 5, wherein the load cell (18) presents a rigid portion (18a) anchored to an inner surface (15a) of the plate (15), and a movable portion (18b), cantilevered from the rigid portion (18a) and anchored to the second end (22a) of the connecting element (22).
A carousel as in claims 3 to 6, wherein the second end (22b) of each connecting element (22) comprises a first portion (26) permanently associated with the respective pedestal (21) and a second portion (27) integral with the first end (22a), and the connecting element (22) also presents a separable coupling element (28) by means of which the first portion (26) and the second portion (27) can be attached and detached to and from one another.
A carousel as in claim 7, wherein the coupling element (28) comprises a tubular portion (28a) associated with the first portion (26), mountable over a projection (28b) presented by the second portion (27), and damageable under a predetermined weight of the container (2) standing on the respective pedestal (21).
A carousel as in preceding claims, further comprising a delivery system (30) housed internally of the carrier element (6), by which air is released under pressure into the enclosure (14).